On review list in OR. See Proceedings of the Biological Society of Washington 33:164 (1920) for original description, and Memoirs of the New York Botanical Garden 21:33-35 (1971) for revised nomenclature.

Quad data is not available for all List 3 and 4 plants. For those that do contain this data, it has not been quality controlled and is potentially incomplete, inaccurate, and/or out of date. Please use caution when referencing this information. We are currently working hard to maintain this data and hope to provide accurate and up to date information in the near future.